/*
 * Copyright (c) 2001,2002,2003 Mike Matsnev.  All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice immediately at the beginning of the file, without modification,
 *    this list of conditions, and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Absolutely no warranty of function or purpose is made by the author
 *    Mike Matsnev.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * $Id: BufFile.h,v 1.19.2.1 2003/04/12 22:52:32 mike Exp $
 * 
 */

#if !defined(AFX_BUFFILE_H__867464A4_888C_4590_A2F7_7126AC072CB6__INCLUDED_)
#define AFX_BUFFILE_H__867464A4_888C_4590_A2F7_7126AC072CB6__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include "ptr.h"
#include "RFile.h"

#define	BEOF	(-1)

class CBufFile
{
public:
  CBufFile(auto_ptr1<RFile> file);
  ~CBufFile() { }

  int	    ch() { return m_ptr<m_cur->len ? m_cur->buf[m_ptr++] : nextbuf_ch(); }
  int	    read(void *buf,int count); // read plain chars

  DWORD	    pos() { return m_cur->off+m_ptr; }
  void	    seek(DWORD pos);
  DWORD	    size() { return m_fp->size(); }
  DWORD	    prevpos() { return m_cur->off+m_ptr-1; }

  CString   CompressionInfo() { return m_fp->CompressionInfo(); }

protected:
  int		  nextbuf_ch();
  void		  swapbuf();

  struct Buf {
    Buffer<BYTE>  buf;
    DWORD	  off;
    DWORD	  len;
    Buf() : buf(RFile::BSZ),off(0),len(0) { }
  };

  auto_ptr1<RFile> m_fp;
  
  DWORD		  m_ptr;
  Buf		  m_b1,m_b2;
  Buf		  *m_cur;
};

#endif // !defined(AFX_BUFFILE_H__867464A4_888C_4590_A2F7_7126AC072CB6__INCLUDED_)
